# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# --------------------------------------------------------------------------
import logging
import uuid
import time
from functools import partial

from .management_link import ManagementLink
from .error import AMQPLinkError, ErrorCondition

from .constants import ManagementOpenResult, ManagementExecuteOperationResult

_LOGGER = logging.getLogger(__name__)


class ManagementOperation(object):
    def __init__(self, session, endpoint="$management", **kwargs):
        self._mgmt_link_open_status = None

        self._session = session
        self._connection = self._session._connection
        self._network_trace_params = {
            "amqpConnection": self._session._connection._container_id,
            "amqpSession": self._session.name,
            "amqpLink": "",
        }
        self._mgmt_link: ManagementLink = self._session.create_request_response_link_pair(
            endpoint=endpoint,
            on_amqp_management_open_complete=self._on_amqp_management_open_complete,
            on_amqp_management_error=self._on_amqp_management_error,
            **kwargs
        )
        self._responses = {}
        self._mgmt_error = None

    def _on_amqp_management_open_complete(self, result):
        """Callback run when the send/receive links are open and ready
        to process messages.

        :param result: Whether the link opening was successful.
        :type result: int
        """
        self._mgmt_link_open_status = result

    def _on_amqp_management_error(self):
        """Callback run if an error occurs in the send/receive links."""
        # TODO: This probably shouldn't be ValueError
        self._mgmt_error = ValueError("Management Operation error occurred.")

    def _on_execute_operation_complete(
        self, operation_id, operation_result, status_code, status_description, raw_message, error=None
    ):
        _LOGGER.debug(
            "Management operation completed, id: %r; result: %r; code: %r; description: %r, error: %r",
            operation_id,
            operation_result,
            status_code,
            status_description,
            error,
            extra=self._network_trace_params,
        )

        if operation_result in (ManagementExecuteOperationResult.ERROR, ManagementExecuteOperationResult.LINK_CLOSED):
            self._mgmt_error = error
            _LOGGER.error(
                "Failed to complete management operation due to error: %r.", error, extra=self._network_trace_params
            )
        else:
            self._responses[operation_id] = (status_code, status_description, raw_message)

    def execute(self, message, operation=None, operation_type=None, timeout=0):
        start_time = time.time()
        operation_id = str(uuid.uuid4())
        self._responses[operation_id] = None
        self._mgmt_error = None

        self._mgmt_link.execute_operation(
            message,
            partial(self._on_execute_operation_complete, operation_id),
            timeout=timeout,
            operation=operation,
            type=operation_type,
        )

        while not self._responses[operation_id] and not self._mgmt_error:
            if timeout and timeout > 0:
                now = time.time()
                if (now - start_time) >= timeout:
                    raise TimeoutError("Failed to receive mgmt response in {}ms".format(timeout))
            self._connection.listen()

        if self._mgmt_error:
            self._responses.pop(operation_id)
            raise self._mgmt_error

        response = self._responses.pop(operation_id)
        return response

    def open(self):
        self._mgmt_link_open_status = ManagementOpenResult.OPENING
        self._mgmt_link.open()

    def ready(self):
        try:
            raise self._mgmt_error
        except TypeError:
            pass

        if self._mgmt_link_open_status == ManagementOpenResult.OPENING:
            return False
        if self._mgmt_link_open_status == ManagementOpenResult.OK:
            return True
        # ManagementOpenResult.ERROR or CANCELLED
        # TODO: update below with correct status code + info
        raise AMQPLinkError(
            condition=ErrorCondition.ClientError,
            description="Failed to open mgmt link, management link status: {}".format(self._mgmt_link_open_status),
            info=None,
        )

    def close(self):
        self._mgmt_link.close()
